Activision-Blizzard

Yes, Call of Duty: Modern Warfare 3 posted a new sales record last week. But Activision Blizzard just can't keep a hold on fickle gamers. Guitar Hero hit a high note, then went silent, and now World of Warcraft is losing population fast.

In August, the Second Life community learned that the company responsible for their virtual world was planning to expand its universe. Linden Lab CEO Rod Humble has been vague, mentioning only that his company is working on a new mobile product separate from its pioneering project. Now we know more.

There are several stocks out there that seem expensive, but only in the rearview mirror -- especially shares of fast-growing tech firms, or companies that do great business overseas. Read on to find out how to spot a stock worth buying.

Even as investors reel from the stock-market roller coaster this week, Wall Street is moving on, with plenty of news on the way. Next week will bring headlines about retail and gaming earnings, as well as quarterly reports from News Corp., SodaStream and some newly public Chinese firms.

Plenty of big names are set to report their earnings in August, including the country's largest cable and satellite television providers, several of China's leading dot-coms, radio giant Sirius XM, car rental companies Zipcar and Avis, and the two biggest video game developers.

Activision Blizzard has added video-game competitor Electronic Arts to its $400 million countersuit against two former executives of "Call of Duty" creator Infinity Ward, claiming that EA tried to lure the executives away while they were still under contract with Activision.

U.S. gamers spent about the same amount of money on video games last year as they did in 2009, even as sales of consoles and other hardware took a plunge. Purchases of physical game discs slid 5%, in spite of the record-breaking success of "Call of Duty: Black Ops," but downloadable and social-network games made up the difference.

At least 5.2 million copies of Activision Blizzard's Call of Duty: Black Ops were illegally downloaded between its Nov. 9 release and the end of 2010. All told, more than 19 million people illegally downloaded five of the top-selling games of 2010. As broadband spreads, so does the piracy.

Activision Blizzard's "Call of Duty: Black Ops" video game has raked in more than $1 billion in sales since its Nov. 9 release, making it the fastest-selling video game in history -- and one of the fastest-selling entertainment products of all time.

Videogame publisher Activision Blizzard said its "Call of Duty: Black Ops" has had the most successful entertainment debut ever, generating more than $650 million in global sales in five days.